does this map look ok?

philbert · Post by **philbert** » Fri Sep 12, 2008 11:43 am

Hi all
Just had a shot at writing a map to match the timing figures i was given for my engine.
could someone more knowledgeable look it it over and let me know if i'm going in the right direction please.
its a2.25 petrol landrover with a high torque conversion.

thanks

philbert · Post by **philbert** » Sat Sep 13, 2008 3:05 pm

well it works but not as good as i had hoped for!
just have to set it up on the rolling road instead.

Post by **brentp** » Sat Sep 13, 2008 3:26 pm

Hi Philbert,

While driving, what areas of the map seem to not work well?

When comparing your map against the one here:
http://www.autosportlabs.org/viewtopic.php?t=1556

I noticed you had quite a bit more advance under cruise / light load.

Regards,

philbert · Post by **philbert** » Sat Sep 13, 2008 4:21 pm

hi Brent
when out on the road the engine has much less bottom end torque than it did with the dizzy.
i'm also having to back of to get it to rev above 3200-3500 rpm.
its quite hard to watch the laptop when your bouncing about on 47 year old leaf springs!
the map you suggest is for a v8?

Post by **brentp** » Sat Sep 13, 2008 6:49 pm

The other map seems to be for a V8 as well.

You might want to make the tuning operation a 2 person affair- one driving and the other bumping the regions of the map up or down. Try using the 3D tuning tool- this was designed to ease on-the-fly tuning.
http://www.autosportlabs.net/MJLJ_V4_Op ... erspective

One more thing, are you confident the static timing (EDIS only) is fixed at 10 degrees BTDC?

Regards,

Gassed'58 · Post by **Gassed'58** » Sat Sep 13, 2008 10:42 pm

Hi Phill,
I guess I'm not really the one to be giving the advice as my own 'jolt is still being soldered !! ( Geoff off of the Series 2 club )
but I've been looking at your map and had a compare with maddocks map for his Landrover 2.25......
There does seem to be some fair bit of difference between the two especially within the early ranges and his also tops out higher too.
Yours looks like it is inducing a flat spot mid range to me ?
http://www.autosportlabs.org/viewtopic.php?t=1149
I thought it might be worth a try downloading his map to give a try of and compare it to your own on the road so to speak.
Hope this is some help in seeing the wood from the trees. Shoot me if talking nonsense !
Regards,
Geoff. ( I just ordered a serial adaptor for usb today, last solders on Sunday, all good so far, fingers crossed, thanks for your help, Geoff ).

philbert · Post by **philbert** » Sun Sep 14, 2008 5:35 pm

Hi Geoff
have tried mr maddocks map and it certainly is better than my first effort!
oh well back to the drawing board then

chrishamblin · Post by **chrishamblin** » Mon Sep 15, 2008 4:54 pm

In my opinion, you have WAY too much advance there... certainly for a starting map... you say you have to back off to get the revs up, that could be because the engine is pinking away and not producing any power! Without being rude, do you know what pinking / pre-ignition is? If not or if you're not sure you'd recognise it, go very careful here as you could be melting your pistons by the second!

I would try something with around 30 deg max advance under load to start off with... and no more than 34 at a normal driving range of about 65kpa.

chrishamblin · Post by **chrishamblin** » Mon Sep 15, 2008 5:00 pm

What type of engine BTW? I can see that some of the 3.5V8's may use quite a bit but as you say 2.2 I'm guessing that's a 4cyl? If so I still think very few engines like that will need that much. Just try dropping all the numbers by a good bit and see if things improve...

philbert · Post by **philbert** » Mon Sep 15, 2008 5:50 pm

chrishamblin wrote:In my opinion, you have WAY too much advance there... certainly for a starting map... you say you have to back off to get the revs up, that could be because the engine is pinking away and not producing any power! Without being rude, do you know what pinking / pre-ignition is? If not or if you're not sure you'd recognise it, go very careful here as you could be melting your pistons by the second!

I would try something with around 30 deg max advance under load to start off with... and no more than 34 at a normal driving range of about 65kpa.

chris yes i know what pinking is thanks.
i did ask for help to create a map but the silence was deafening.
i used the figures i was given perhaps I have got my sums wrong never mind i will try again.

DannyP · Post by **DannyP** » Tue Sep 16, 2008 12:36 am

Phil, I understand you are looking for help, but it has only been 4 days since your first post. Some of us only check once or twice a week on here, and a lot of us have zero experience with your motor. Not to rank on you at all, I know how it feels to not know the answer and to NEED help finding it.

You probably don't want to add any more advance after the engine's torque peak, whatever rpm that is. I actually retard 4 degrees per thousand rpm 1000 rpm above my torque peak. You may want to dial back the advance under part load to under 40 degrees, I don't think any motor likes 50 degrees of advance, even at high rpm. My max advance under full load ends up at 32-33 degrees(I program 30, but I was about 2.5 degrees off in placement of my trigger wheel). My max part-load is 38.5 or less. This is a type1 aircooled VW based engine, 2.2 liter and 180 hp. Doesn't have much in common with yours, but I hope the general stuff helps.

philbert · Post by **philbert** » Tue Sep 16, 2008 8:44 am

Danny thanks for that.
yes it is VERY frustrating i asked for help away back in june but very little was forthcoming.
i just dont understand ignition maps at all give me something mechanical and im pretty good
i'm not after someone to write me a map but just enough insite so i can write my own.